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<blockquote data-quote="rsenden" data-source="post: 1108999" data-attributes="member: 24295">Thanks again for the suggestions. I ran the DPC latency analysis too l; the absolute maximum latency is around 300us (and usually between 70-130us), so according to this tool 'This machine should be able to handle real-time streaming of audio and/or video data without drop-outs.'.I think I have disabled most power saving settings, for example HDD is set to never spin down, and USB selective suspend is turned off. Any particular settings that I could look at?I'm using the latest available Terratec drivers and just updated the drivers for the Intel USB 3.0 controller &amp; hub to the latest version available on the Intel site, but without any difference. So if it is a driver problem, I'm not sure whether I can do much about it. But since I do not have the issue when the tuners are connected to different USB controllers, I guess it is more likely to be a problem with the USB controller (or the Terratec drivers do not like multiple tuners connected to the same controller).With regards to 'some device to convert the USB 2.0 signal into a USB 3.0 signal' I actually meant something like adding an additional, external USB controller on one of the USB 3.0 ports. Maybe the following picture explains it better:&nbsp; [ATTACH=full]157357[/ATTACH]So, as far as the Mac Mini is concerned, only one of the tuner devices is using the USB 2.0 bandwidth, whereas the other tuner device is using USB 3.0 bandwidth. No idea whether something like this exists, or whether the USB standard even supports such a use case. According to <a href="http://en.wikipedia.org/wiki/USB_hub" target="_blank">http://en.wikipedia.org/wiki/USB_hub</a>, this would be similar to a Transaction Translator, but a quick Google search shows that this probably does not exist for USB 3.0/2.0.Regards,Ruud</blockquote>

[QUOTE="rsenden, post: 1108999, member: 24295"] Thanks again for the suggestions. I ran the DPC latency analysis too l; the absolute maximum latency is around 300us (and usually between 70-130us), so according to this tool 'This machine should be able to handle real-time streaming of audio and/or video data without drop-outs.'. I think I have disabled most power saving settings, for example HDD is set to never spin down, and USB selective suspend is turned off. Any particular settings that I could look at? I'm using the latest available Terratec drivers and just updated the drivers for the Intel USB 3.0 controller & hub to the latest version available on the Intel site, but without any difference. So if it is a driver problem, I'm not sure whether I can do much about it. But since I do not have the issue when the tuners are connected to different USB controllers, I guess it is more likely to be a problem with the USB controller (or the Terratec drivers do not like multiple tuners connected to the same controller). With regards to 'some device to convert the USB 2.0 signal into a USB 3.0 signal' I actually meant something like adding an additional, external USB controller on one of the USB 3.0 ports. Maybe the following picture explains it better: [ATTACH=full]157357[/ATTACH] So, as far as the Mac Mini is concerned, only one of the tuner devices is using the USB 2.0 bandwidth, whereas the other tuner device is using USB 3.0 bandwidth. No idea whether something like this exists, or whether the USB standard even supports such a use case. According to [url]http://en.wikipedia.org/wiki/USB_hub[/url], this would be similar to a Transaction Translator, but a quick Google search shows that this probably does not exist for USB 3.0/2.0. Regards, Ruud [/QUOTE]

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